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Question

If f(x)=x25x+1, evaluate f(2)f(1)+f(13)

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Solution

f(x)=x25x+1
f(2)=225×2+1
=410+1
=6+1
=5
f(1)=(1)25×1+1
=1+5+1
=7
f(13)=1325×13+1
=1953+1
=19159+99
=10159
=59
f(2)f(1)+f(13)=5759
=1259
=10859
=1139

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